// uuid.cpp - v1.1
/*
 *  Copyright (c) 2007 Leigh Johnston.
 *
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 *     * Neither the name of Leigh Johnston nor the names of any
 *       other contributors to this software may be used to endorse or
 *       promote products derived from this software without specific prior
 *       written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 *  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 *  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <neolib/neolib.hpp>
#include <neolib/openssl.hpp>
#include <neolib/uuid.hpp>

namespace neolib
{
    uuid generate_uuid()
    {
        uint8_t key[16];
        if (!openssl::instance().generate_key(key, sizeof(key)))
            throw unable_to_generate_uuid();
        uuid result{ 
            *reinterpret_cast<const uint32_t*>(&key[0]),
            *reinterpret_cast<const uint16_t*>(&key[sizeof uint32_t]),
            *reinterpret_cast<const uint16_t*>(&key[sizeof uint32_t + sizeof uint16_t]),
            *reinterpret_cast<const uint16_t*>(&key[sizeof uint32_t + sizeof uint16_t + sizeof uint16_t]),
            {
                key[sizeof uint32_t + sizeof uint16_t + sizeof uint16_t + sizeof uint16_t + 0],
                key[sizeof uint32_t + sizeof uint16_t + sizeof uint16_t + sizeof uint16_t + 1],
                key[sizeof uint32_t + sizeof uint16_t + sizeof uint16_t + sizeof uint16_t + 2],
                key[sizeof uint32_t + sizeof uint16_t + sizeof uint16_t + sizeof uint16_t + 3],
                key[sizeof uint32_t + sizeof uint16_t + sizeof uint16_t + sizeof uint16_t + 4],
                key[sizeof uint32_t + sizeof uint16_t + sizeof uint16_t + sizeof uint16_t + 5]
            }
        };
        result.iPart3 = static_cast<uint16_t>((result.iPart3 & (0x0FFF)) | (0x4 << 12));
        result.iPart4 = static_cast<uint16_t>((result.iPart4 & (0b0011111111111111)) | (0b10 << 14));
        return result;
    }
}